21244463 has 2 divisors, whose sum is σ = 21244464. Its totient is φ = 21244462.

The previous prime is 21244459. The next prime is 21244469. The reversal of 21244463 is 36444212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21244463 - 2² = 21244459 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21244469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622231 + 10622232.

It is an arithmetic number, because the mean of its divisors is an integer number (10622232).

Almost surely, 2^21244463 is an apocalyptic number.

21244463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21244463 is an equidigital number, since it uses as much as digits as its factorization.

21244463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 26.

The square root of 21244463 is about 4609.1716175469. The cubic root of 21244463 is about 276.9588534242.

Adding to 21244463 its reverse (36444212), we get a palindrome (57688675).

The spelling of 21244463 in words is "twenty-one million, two hundred forty-four thousand, four hundred sixty-three".